Silicon nutrition of rice is affected by soil pH, weathering, and silicon fertilisation

Article


Tavakkoli, Ehsan, Lyons, Graham, English, Peter and Guppy, Chris. 2011. "Silicon nutrition of rice is affected by soil pH, weathering, and silicon fertilisation." Journal of Plant Nutrition and Soil Science. 174 (3), pp. 437-446. https://doi.org/10.1002/jpln.201000023
Article Title

Silicon nutrition of rice is affected by soil pH, weathering, and silicon fertilisation

ERA Journal ID5262
Article CategoryArticle
AuthorsTavakkoli, Ehsan (Author), Lyons, Graham (Author), English, Peter (Author) and Guppy, Chris (Author)
Journal TitleJournal of Plant Nutrition and Soil Science
Journal Citation174 (3), pp. 437-446
Number of Pages10
Year2011
Place of PublicationWeinheim, Germany
ISSN0044-3263
1436-8730
1522-2624
Digital Object Identifier (DOI)https://doi.org/10.1002/jpln.201000023
Abstract

Silicon (Si) is a beneficial element for tropical grasses such as rice (Oryza sativa) and responses to applications of Si are common on highly weathered soils. However, the importance of pH (and hence Si speciation), weathering, and fertilisation on Si uptake is still poorly understood. The
responses of rice to Si fertilisation were studied in two variably weathered basalt soils (Red Ferrosol, Grey Vertosol) adjusted at different pH values (5.5–9.5) with three levels of acidulated wollastonite.
Soil Si was extracted using deionised water (H2O), 0.01 M CaCl2, or 0.5 M NH4OAc. Significant increases in Si uptake and rice biomass were observed in the Red Ferrosol following
fertilisation (p < 0.01). Greater biomass production was observed at lower pH, due to decreased Si sorption and higher solution Si concentrations. Silicon uptake by rice was greater at low pH, despite similar extractable Si concentrations; suggesting a relationship between Si speciation and uptake. In contrast, Si uptake and rice shoot dry matter in the less weathered Grey Vertosol were unaffected by Si fertilisation (p > 0.05) except at the highest rate and lowest pH (5.5). Solution Si concentrations were controlled by recipitation/polymerisation reactions in equilibrium with specific soil pH values rather than adsorption processes. Silicon speciation effects (monosilicic acid vs. silicate ions) were unable to be measured due to an induced phosphorus deficiency in both soils at pH values > 8.5. In conclusion, weathered soils are more responsive to Si fertilisation and Si uptake is increased at low pH.

Keywordssilicon; pH; weathering; acidulated wollastonite; rice; fertilisation
ANZSRC Field of Research 2020410604. Soil chemistry and soil carbon sequestration (excl. carbon sequestration science)
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Byline AffiliationsNational Centre for Engineering in Agriculture
University of New South Wales
Institution of OriginUniversity of Southern Queensland
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